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Optogenetic Stimulation Shifts the Excitability of Cerebral Cortex from Type I to Type II: Oscillation Onset and Wave Propagation

Fig 4

Type I excitability in an isolated pair of excitatory-inhibitory populations.

All parameters were the same as for type II excitability except that the threshold of inhibition was increased from bi = 4 to bi = 8. A: Return trajectories in the phase plane. B: Time plots of the return trajectories. C: Bifurcation diagram of Ue versus Je. The critical point of the SNIC bifurcation marks the abrupt onset of large-amplitude oscillations in Ue.

Fig 4